Flat roof in Belgium: EPDM or bitumen, what does it cost per m² in 2026?
Short answer: In Belgium in 2026, a flat roof costs roughly €55 to €140 per m² in EPDM and €40 to €120 per m² in bitumen (roofing), installed. Renovation including insulation comes to €90 to €210 per m² according to the sources. The spread depends on stripping the old layer, details, finish level and whether a price includes VAT.
Prices in this article are indicative Belgian market ranges, not Alpha Services Benelux's price list. Your fixed price is in the quote.
What a flat roof costs per m²: EPDM and bitumen
Most sources put EPDM €15 to €20 per m² above bitumen, but the figures differ widely. Below are the membrane-only prices, installation included.
| Source | EPDM | Bitumen (roofing) |
|---|---|---|
| Bobex (excl. VAT) | €55–€80 (renovation with stripping €80–€120) | €40–€75 |
| Rénover Maison | €60–€110 | €40–€70 |
| Guide Travaux Toiture | €55–€90 | €40–€65 |
| Homedeal | €90–€120 | €60–€85 |
| Tafsquare (incl. VAT) | €90–€140 | €80–€120 |
| Overall market range | €55–€140 | €40–€120 |
Because the sources disagree, we give the widest range. Where you land depends on finish level, roof complexity and whether the old layer must be removed. Always check whether a price includes or excludes VAT.
Lifespan and manufacturer warranty: EPDM vs bitumen
Sources give EPDM 30 to 50 years and bitumen 15 to 30 years. The higher upfront price is spread over a longer period.
| Feature | EPDM | Bitumen (roofing) |
|---|---|---|
| Lifespan | 30–50 years (40–50 at Bobex and Rénover Maison) | 15–30 years |
| Manufacturer warranty, typically | 20–30 years | 10–15 years |
| Weak points | Connections, penetrations, upstands; shrinkage up to 4% | Seams and overlaps |
A manufacturer warranty covers the material and, according to the sources, requires installation following the manufacturer's system. It is not the same as the contractor's liability. Ask for the terms in writing, including conditions such as minimum slope.
Renovating a flat roof with insulation (PIR)
If the roof is being opened anyway, insulating at the same time costs €90 to €210 per m² according to the sources. In a warm roof the insulation, often rigid PIR boards, sits beneath the waterproofing layer.
| Source | Total per m² |
|---|---|
| Homedeal (renewal + insulation) | €90–€150 |
| Bobex (complete roof with insulation, excl. VAT) | €100–€180 |
| Rénover Maison (insulated EPDM) | €100–€170 |
| Guide Travaux Toiture (EPDM with insulation) | €140–€210 |
| Overall market range | €90–€210 |
Rénover Maison counts an insulation supplement of €30 to €60 per m², without specifying the insulation type. For 60 m², Homedeal gives €5,400 to €9,000. Tafsquare quotes €4,000 to €8,000 for 50 m² and €8,000 to €16,000 for 100 m², varying with stripping and finish.
What drives the price of a flat roof
Stripping, substrate, details and finish matter more than the membrane brand alone.
- Removing the old layer: €10 to €40 per m² extra according to Tafsquare, €15 to €30 for old bitumen at Guide Travaux Toiture.
- Substrate: damaged roof decking can add €20 to €40 per m² (Homedeal).
- Details: upstands, edges, penetrations and drains. Tafsquare advises replacing drains older than 15 years.
- Surface area: above 150 m², the price per m² drops 15 to 20% according to Guide Travaux Toiture.
- Slope: a slope below 2% loads the membrane over time.
- Insulation thickness and the chosen waterproofing type.
Signs of a leaking flat roof
A stain on the ceiling is often a late signal: the insulation is then likely already soaked. Have a professional assess the roof if you notice any of these.
- A puddle that does not disappear after several dry days.
- Lifting edges or a seam gaping at an upstand.
- Blisters, small cracks or shrinkage at connections.
- Drains blocked by leaves or moss, one of the most frequent causes of leaks according to Rénover Maison.
- A damp patch on the ceiling inside.
Rénover Maison suggests inspecting twice a year and after severe weather. The wet spot indoors is not always directly under the leak, so have the cause identified before accepting a quote.
Comparing quotes and avoiding surprises
Only compare quotes that share the same build-up, the same stripping scope and the same VAT basis. See also our renovation page and the roof works overview.
- Ask for a written quote after a site visit, stating surface area, build-up and drain details.
- Check that stripping, waste disposal and substrate repair are included.
- Ask for the insulation type and thickness, and the EPDM membrane thickness.
- Ask separately for the manufacturer warranty and the contractor's own guarantee.
- Check whether prices include or exclude VAT.
For a first idea of your overall budget, try the renovation calculator. All amounts in this article are market ranges, not the price list of Alpha Services Benelux.
VAT and grants
For a private home older than 10 years, 6% VAT can apply instead of 21%. According to Guide Travaux Toiture, this requires the same contractor to supply and install the materials; materials you buy yourself stay at 21%. Check the conditions on the official FPS Finance page.
For possible grants on roof insulation, consult your official regional portal (vlaanderen.be/mijn-verbouwpremie, energie.wallonie.be, or your municipality and Homegrade in Brussels).
Fixed quote after a site visit
Alpha Services Benelux does the work with its own team, active since 2014. VAT BE 0541.320.178.
Request a quoteFrequently asked questions
How much does a flat roof cost per m² in Belgium?
About €55 to €140 per m² for EPDM and €40 to €120 per m² for bitumen, installed. With insulation it is €90 to €210 per m². Stripping, details and VAT explain the spread.
Is EPDM better than bitumen roofing?
EPDM lasts longer (30 to 50 years versus 15 to 30) and often costs €15 to €20 more per m². Bitumen is cheaper upfront. In both cases the quality of the details is decisive.
How long is the manufacturer warranty on EPDM and bitumen?
Sources mention 20 to 30 years for EPDM and 10 to 15 years for bitumen, provided installation follows the manufacturer's system. Ask for the terms in writing, including minimum slope.
How do I recognise a leak in a flat roof?
Watch for puddles lasting several dry days, lifting edges, gaping seams at upstands, blisters and ceiling stains. Have a professional identify the cause.
Should I insulate when renewing a flat roof?
Renewing and insulating together costs €90 to €210 per m² according to the sources. The insulation supplement is €30 to €60 per m² per Rénover Maison. If the roof is open anyway, you avoid two separate jobs.
Which VAT applies to a new flat roof?
For a private home over 10 years old, 6% can apply if the contractor invoices materials and installation, otherwise 21%. Check the conditions with FPS Finance.
Sources
- EPDM of Roofing: Vergelijking, Prijzen per m² en Advies 2026 — Bobex
- Wat kost een plat dak vernieuwen? 2026 Prijzen — Homedeal
- Prix de l'étanchéité d'une toiture plate (EPDM, roofing) en Belgique — Rénover Maison
- Toiture EPDM : durée de vie, pose et prix au m² en Belgique — Guide Travaux Toiture
- Réfection toiture prix 2026 : budgets et devis Belgique — Tafsquare
- EPDM Plat Dak: Kosten, Levensduur en Aandachtspunten — Dakwerken-gids.be
- Bouwen en verbouwen — FOD Financiën